《油气长输管线剩余寿命预测》-毕业论文（设计）.doc

精品 精品 分类号 单位代码 密 级 学 号 学生毕业设计（论文） 题 目 油气长输管线的腐蚀 剩余寿命预测 作 者 院 (系) 化学与化工学院 专 业 过程装备与控制工程 指导教师 答辩日期 年 月 日 摘 要 油气长输管线通常埋置地下，不可避免遭受土壤腐蚀。建于上世纪七、八十年代的管线已经处于寿命的中后期，管道运行存在一定的危险性。因此，预测在役管线的剩余寿命对于制定管线的运行和维修方案具有重要意义。 本文对油气长输管线的腐蚀类型、腐蚀机理、腐蚀因素、腐蚀特点进行了全面、深入的分析；阐述了长输管线剩余寿命预测的基本原则、寿命预测中的关键技术以及预测的重点和处理方法；通过分析长输管线沿线内压的分布，建立了基于B31G爆破方程的腐蚀缺陷极限尺寸模型；最后通过点腐蚀和均匀腐蚀具体的说明油气长输管线剩余寿命的预测。 关 键 词：油气长输管线；腐蚀速率；剩余强度；剩余寿命预测 研究类型：综合研究 精品 ABSTRACT Long-distance transportation oilgas pipelines are usually buried underground; they can unavoidably be corroded due to the soil environments around them. The pipelines which built in the 1970s and 1980s are being their evening, which is dangerous to some extent in their operation. So, residual life-span prediction is of important sense to the decision possess for operating, maintenance or replacing of pipeline with corrosion defect. The paper analyses the corrosion types, mechanisms, characteristic and factors of　long-distance transportation pipeline; the basic principle and procedure of predicting the　remaining life of pipeline, key points that affect the prediction, the emphasis should be laid during prediction and predicting solutions are described; the writer analyses the internal　pressure along oil-pipelines，and from the explosion equation in B31G the limit size model of　corrosion defects is established; According to different corrosion shapes, this paper gives the residual life prediction model and corrosion rate model on the analyses of electrochemistry corrosion mechanistic; combine with criteria of residual strength, corrosion defects size is　checked, and corrosion residual life-span is determined finally. Keywords: Long-distance transportation oilgas pipeline; corrosion rate; residual strength; prediction of residual life-span Thesis: comprehensive study 精品 目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _To